From 060e0ea284719b5b9ddd4635bc6a5ede65bad464 Mon Sep 17 00:00:00 2001 From: Joachim Wiberg Date: Sun, 7 Jun 2026 20:45:37 +0200 Subject: [PATCH] board: some sim card help on the bpi-r4 Signed-off-by: Joachim Wiberg --- board/aarch64/bananapi-bpi-r4/README.md | 42 +++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/board/aarch64/bananapi-bpi-r4/README.md b/board/aarch64/bananapi-bpi-r4/README.md index d9cb6eda..fae64112 100644 --- a/board/aarch64/bananapi-bpi-r4/README.md +++ b/board/aarch64/bananapi-bpi-r4/README.md @@ -87,6 +87,45 @@ Infix ships with the following factory defaults. > are bridged into the LAN as access points. WiFi is not included with the board > and is not part of the factory default configuration. +## SIM Card Installation + +The BPI-R4 has three SIM holders, one per PCIe slot: + +| Slot | PCIe socket | Typical use | +|----------|-------------|--------------------------| +| **SIM1** | M.2 Key-B | 4G/5G WWAN modem | +| **SIM2** | mPCIe #1 | Cellular or other modem | +| **SIM3** | mPCIe #2 | Cellular or other modem | + +All three take **nano-SIM (4FF)** cards. + +> [!NOTE] +> The official Banana Pi pages show an older board revision with a sliding +> "sled" holder. Newer boards ship with a fixed friction-fit holder instead: +> there is no lid to lift and no spring eject. The [closest matching photo on +> bananapi.org][15] shows the current mechanism. + +### Inserting a SIM + +1. Orient the card with the gold contacts facing the PCB (printed + side up) and the cut corner pointing toward the M.2/mPCIe socket, + which on this board is also toward the outer edge. The silkscreen + next to each holder shows the same outline. +2. Push the SIM straight in until it is fully seated. There is no + click and the holder is not spring-loaded, so press firmly until + the contacts engage and the rear edge of the card sits flush with + the holder. +3. A SIM that still protrudes is not fully inserted; push again. + +### Removing a SIM + +The friction grip on these holders is tight. Gently pry the card out +with a fingernail or a thin plastic spudger. Avoid metal tweezers +near the contacts. Removing the front panel of the metal case is +absolutely necessary to access the SIM holder. + +For software configuration once the modem is recognised, see the +[Cellular Modem User's Guide][16]. ## Getting Started @@ -358,3 +397,6 @@ make aarch64 [12]: https://github.com/frank-w/u-boot/releases [13]: https://github.com/frank-w/u-boot/releases/download/CI-BUILD-2026-01-bpi-2026.01-2026-01-15_2013/bpi-r4_spim-nand_bl2.img [14]: https://github.com/frank-w/u-boot/releases/download/CI-BUILD-2026-01-bpi-2026.01-2026-01-15_2013/bpi-r4_spim-nand_fip.bin +[15]: https://docs.banana-pi.org/bpi-r4/bpi-r4_4g5g_2.jpg +[16]: https://www.kernelkit.org/infix/latest/modem/ +